just start with phoenix and use it til you run into limitations, or want to upgrade to a more advanced 'node in the phone' setup such as zeus or blixt wallet. especially if all were talking about is a pocket change amount. If you aren't going to be sending zaps or small amts and rather are going to be making larger buys (think like $10 +) over lightning, aqua is a decent simple option (tradeoffs abound).